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libposix: add rename

This commit is contained in:
Giacomo Tesio 2017-09-07 23:25:34 +02:00
parent e3ff5b1004
commit 1f3203e6d3
1 changed files with 68 additions and 0 deletions
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68
sys/src/lib/posix/files.c
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@ -617,6 +617,74 @@ FailWithError:
return -1;
}
int
POSIX_rename(int *errnop, const char *from, const char *to)
{
int n, ffd = -1, tfd = -1;
const char *f, *t;
char buf[8192];
PosixError e = 0;
Dir *d, nd;
if(from == nil || to == nil){
e = PosixENOENT;
goto FailWithError;
}
f = strrchr(from, '/');
t = strrchr(to, '/');
f = f ? f+1 : from;
t = t ? t+1 : to;
if(strcmp(".", f) == 0 || strcmp("..", f) == 0
|| strcmp(".", t) == 0 || strcmp("..", t) == 0){
e = PosixEINVAL;
goto FailWithError;
}
if(access(to, AEXIST) == 0){
if(remove(to) < 0){
e = PosixEACCES;
goto FailWithError;
}
}
if((d = dirstat(from)) == nil){
e = PosixENOENT;
} else if(f-from == t-to && strncmp(from, to, f-from) == 0){
/* from and to are in same directory (we miss some cases) */
nulldir(&nd);
nd.name = (char*)t;
if(dirwstat(from, &nd) < 0)
e = PosixEPERM;
} else {
/* different directories: with 9P2000 we have to copy */
if((ffd = open(from, OREAD)) < 0
|| (tfd = create(to, OWRITE, d->mode)) < 0){
e = PosixEPERM;
}
while(e == 0 && (n = read(ffd, buf, sizeof(buf))) > 0)
if(write(tfd, buf, n) != n)
e = PosixEIO;
if(ffd >= 0)
close(ffd);
if(tfd >= 0)
close(tfd);
if(e == 0 && remove(from) < 0)
e = PosixEIO;
if(e == PosixEIO && tfd >= 0)
remove(to);
}
if(e != 0)
goto FailWithError;
free(d);
return 0;
FailWithError:
if(d != nil)
free(d);
*errnop = __libposix_get_errno(e);
return -1;
}
int
POSIX_mkdir(int *errnop, const char *path, int mode)
{